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Invalid Pointer Operation Error Delphi


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share|improve this answer answered Jan 18 '13 at 15:33 Rob Kennedy 130k13191355 Is it also thrown if you try to free the address of a locally declared object? –Wolf This is what it looks like. Browse other questions tagged delphi debugging exception delphi-xe or ask your own question. You say that you must use dynamically allocated PChar buffers. http://stackoverflow.com/questions/10113097/invalid-pointer-operation-delphi-xe

Invalid Pointer Operation Fix

It may fail to handle the exception, but then the low level handler will do the work. Try this and let me know. Is foreign stock considered more risky than local stock and why? What are the legal consequences for a tourist who runs out of gas on the Autobahn?

  1. LörAn View Public Profile Send a private message to LörAn Visit LörAn's homepage!
  2. P.S.
  3. And it's much faster than a standard memory manager in old Delphi versions (FastMM is a default memory manager in current Delphi releases).
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  5. Perhaps like this: ptr := AllocMem(40); StrCopy(ptr, 'OneNationUnderGod'); Now we are fine to call FreeMem, because ptr still contains the address that the call to AllocMem provided.
  6. That much is fine.
  7. As far as I can remember, I was not doing anything special in TC, only checking what options the contextual menu offered when on a specific folder.
  8. I'll use it, since it is a more "portable" solution.
  9. delphi pointers memory-management runtime-error share|improve this question asked Jan 2 '14 at 9:03 world peace 7218 add a comment| 3 Answers 3 active oldest votes up vote 5 down vote accepted
  10. Back to top MarcinWPower MemberJoined: 23 Jan 2012Posts: 592Location: Poland Posted: Fri Feb 01, 2013 2:36 am Post subject: Additional note: similar to the exception C0000006, EOutOfMemory doesn't need to display

How to unlink (remove) the special hardlink "." created for a folder? 기계 (gigye) ==> 機械, 器械, 奇計 (what else?) How to give player the ability to toggle visibility of the See you. Comment Submit Your Comment By clicking you are agreeing to Experts Exchange's Terms of Use. Exception Einvalidpointer In Module Invalid Pointer Operation When you create an instance with Create(nil) it's not owned by anyone and you can safely call Free on it. (See also What is the meaning of nil owner in component

Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj… Delphi Implementing a Invalid Pointer Operation Windows 7 Create(Nil) should be the correct way here. –LU RD Feb 17 '13 at 11:07 @LURD - what I do not understand is why this code is working when closing Meaning of grey and yellow/brown colors of buildings in google maps? http://stackoverflow.com/questions/20879473/delphi-invalid-pointer-operation This means that the Total Commander tried to read a memory, but reading a memory page failed.

All 3 pointers where initialized with for i := 0 to 1000 do begin ptr1^[i]:=0;ptr2^[i]:=0;ptr3^[i]:=0; end; While this poor programing did not bother Pascal in Delphi a call to Dispose any Invalid Pointer Operation In C++ Related 2Invalid pointer operation in TMonitor.Destroy0Invalid Pointer Operation + Call Stack8Invalid Pointer Operation - Delphi XE-2EInvalidPointer message with 'Invalid Pointer Operation'0Delphi 7 Invalid Pointer Operation with Custom Component1delphi invalid pointer operation0Delphi And we probably have much more serious problem than not executing our exception handler... You asked AllocMem for a new block of memory and then immediately discarded that block of memory.

Invalid Pointer Operation Windows 7

However actually - considering values - what you did was ptrA:=AllocMem(40); ptrB:=Pchar('OneNationUnderGod'); if ptrB<>nil then FreeMem(ptrB); Every new assignment changes the value overwriting the previous one, thus you freeing another pointer How to add line separators between columns in Latex table? Invalid Pointer Operation Fix If I have to use the Pchar sentence, how should I free the memory allocated earlier? Invalid Pointer Operation Sql VCL exception handler should be installed at the very beginning of the FormCreate event (of the main form) and deinstalled at the very end of the FormDestroy event.

Delphi Pages - Archive - Top - Contact Us Powered by vBulletin Version 3.8.8Copyright ©2000 - 2016, vBulletin Solutions, Inc. weblink Try this: Code: procedure TForm1.Button1Click(Sender: TObject); begin try {We damage SEH stack frame - we set exception handler address to nil} asm mov LörAn View Public Profile Send a private message to LörAn Visit LörAn's homepage! Since you have also freed that object, you have a double-free error, which meets the first criterion I listed above. Invalid Pointer Operation Windows 10

Low level exception handler should be installed at the very beginning of the main project file (.dpr), before any other lines, before Application.Initialize. ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: Connection to failed. Linked 3 What is the meaning of nil owner in component constructor Related 1Invalid pointer exception when closing app after upgrade from Delphi 2006 to Delphi XE3Delphi “E2064 Left side cannot navigate here I will enable DCU and see what happens. –ThN Apr 11 '12 at 20:16 @DavidHeffernan, after the break with dcu enabled, debugger stopped in System.pas file.

You didn't allocate that string list, and the documentation doesn't tell you to free it, so it's reasonable to expect that the list actually belongs to the dialog component, and that What Does Invalid Pointer Operation Mean I linked Fcoll with list of VCL (I used the Objects property in Tstringlist to maintain a list of VCL )and I create and release the child MDI form many times. Please post the code which you are using to create and release your component.

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I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid… Delphi Xpdf - PDFfonts - Command Line Utility to Join them; it only takes a minute: Sign up Invalid Pointer Operation - Delphi XE up vote 8 down vote favorite 2 I can't seem to figure this one out. also I noticed that after Fcoll.free;// free Tstringlist executed the Fcoll still hold a valid values. Fastmm How do you figure this one out?

share|improve this answer answered Sep 23 at 21:07 Dick Brown 111 add a comment| up vote 0 down vote I have been caught out by this type of "indicated error" during Function creating function, compiled languages equivalent Is it illegal for regular US citizens to possess or read the Podesta emails published by WikiLeaks? Are you running with FastMM in Full Debug mode? –David Heffernan Apr 11 '12 at 20:09 @DavidHeffernan, :) I remember we had a conversation about FastMM. http://auctusdev.com/invalid-pointer/invalid-pointer-error.html Find the value OPTIMIZE FOR UNKNOWN is using Cartoon movie with archery tournament with "paintball" arrows, people dressed as animals What would You-Know-Who want with Lily Potter?

Bit confusing but I thinking its because one of Mason wheeler's reason. When stopping on a breakpoint this can cause Delphi's debugger to attempt to display the value via a function call that accesses an uninitialised Pointer or variable. Back to top MarcinWPower MemberJoined: 23 Jan 2012Posts: 592Location: Poland Posted: Fri Feb 01, 2013 2:55 am Post subject: I overlooked something. asked 7 years ago viewed 24848 times active 7 years ago Blog Stack Overflow Podcast #91 - Can You Stump Nick Craver?

I found none and they execute as expected without any error. The debugger has detected the exception thrown by the memory manager, so do some debugging. What you presumably mean to do is to copy the string. Join & Ask a Question Need Help in Real-Time?

In that case, you'd be attempting to free memory allocated on the stack. –Rob Kennedy Jan 13 '15 at 13:18 Thanks. StrCopy is sometimes fine if you allocate the correct sized buffer. Why do people move their cameras in a square motion? Low level handler is the last resort handler - it kills the application with exit code 1 and it is being fired: a) for threads (other than the main thread), b)